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Analog Devices Inc. LT3972HMSE#TRPBF
- Part No.:
- LT3972HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3972HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
LT3972HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 33V-input, 3.5A synchronous step-down switching regulator with current-mode control, 75µA quiescent current in Burst Mode®, and adjustable 200kHz–2.4MHz switching frequency. It integrates a 95mΩ NPN switch, boost Schottky diode, soft-start, power good flag, and thermal protection - designed for automotive battery regulation and industrial supplies requiring wide input range and high reliability at junction temperatures up to 150°C.
For engineers reviewing the LT3972HMSE#TRPBF datasheet, LT3972HMSE#TRPBF pinout, LT3972HMSE#TRPBF application, or LT3972HMSE#TRPBF equivalent, key selection considerations include its –40°C to 150°C operating junction temperature, integrated boost diode, 0.79V feedback reference, 62V transient tolerance, and MSOP-10 thermally enhanced package with exposed pad.
Technical Context
The LT3972HMSE#TRPBF implements constant-frequency current-mode PWM control using an internal oscillator set by the RT pin resistor. Its bipolar NPN switch is driven via an external BOOST capacitor/diode network to ensure saturation across input voltages up to 33V, enabling high efficiency even at low duty cycles.
Burst Mode® operation reduces quiescent current to 75µA while maintaining output ripple below 15mVP-P; bias current can be drawn from VOUT when >3V to further improve light-load efficiency. Overvoltage lockout disables switching above 33V (typ), allowing safe 62V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 33V continuous; withstands 62V non-repetitive transients - enables direct connection to automotive batteries and industrial 24/36V rails. |
| Max Output Current | 3.5A DC - supports high-current point-of-load conversion without external MOSFETs. |
| Quiescent Current | 75µA at 12VIN → 3.3VOUT in Burst Mode® - extends battery life in always-on systems. |
| Switch On-Resistance | 95mΩ - minimizes conduction loss and thermal rise under full load. |
| Feedback Reference | 0.790V ±10mV - enables precise output voltage programming from 0.79V to 30V using standard resistors. |
| Switching Frequency | 200kHz to 2.4MHz (adjustable via RT pin) - allows optimization of inductor size, efficiency, and EMI profile. |
| Thermal Rating | Junction temperature range: –40°C to +150°C - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
LT3972HMSE#TRPBF is housed in a 10-lead plastic MSOP package with exposed pad (Pin 11 = GND), offering θJA = 45°C/W and θJC = 10°C/W for robust thermal performance. The exposed pad must be soldered to PCB ground for optimal heat dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Connection | Supplies bias current to internal regulator; connects to Schottky diode anode for BOOST capacitor charging. |
| BOOST (Pin 2) | Switch Gate Drive Boost Supply | Provides voltage > VIN to fully saturate internal NPN switch; requires external capacitor and Schottky diode. |
| SW (Pin 3) | Switch Node Output | Connects to inductor, catch diode cathode, and BOOST capacitor - carries high di/dt switching current. |
| VIN (Pin 4) | Main Input Power Supply | Supplies internal regulator and switch driver; must be locally bypassed with ≥10µF ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = on); RC ramp on this pin controls output voltage slew rate during startup. |
| SYNC (Pin 6) | External Clock Synchronization Input | Accepts 250kHz–2MHz clock for EMI reduction; tie to GND for Burst Mode® operation. |
| PG (Pin 7) | Power Good Open-Collector Flag | Asserts low until VOUT reaches 91% of target; requires external pull-up for system monitoring. |
| FB (Pin 8) | Feedback Voltage Sense | Regulated to 0.790V; connects to resistor divider tap for output voltage programming. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; used with RC compensation network for loop stability. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency from 200kHz to 2.4MHz per datasheet table. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external diode requirement and associated layout complexity while reducing BOM count and footprint. |
| Low-Ripple Burst Mode® Operation | Maintains <15mVP-P output ripple at light loads with 75µA IQ, avoiding audible noise and preserving regulation accuracy. |
| Thermally Enhanced MSOP-10 Package | Exposes die pad as Pin 11 (GND) for low thermal resistance (θJC = 10°C/W), enabling 3.5A operation without heatsink in compact layouts. |
| Overvoltage Lockout (OVL) | Disables switching at VIN >33V (min), protecting downstream circuitry during load dump or surge events up to 62V. |
| Power Good Flag with Hysteresis | PG asserts valid only when FB reaches 91% of target with 10mV hysteresis - provides reliable system power sequencing signal. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to stable 3.3V or 5V for infotainment, ADAS sensors, and body control modules. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, high-efficiency DC-DC conversion with 62V transient immunity. Use Value: Enables single-stage conversion from raw battery to logic rails without pre-regulator, reducing component count and board space. |
Use Scenario: Local point-of-load regulation in industrial PLCs, motor drives, and programmable logic controllers where multiple isolated supply domains are required. IC Role / Device Role / Timing Role: High-current, wide-input buck regulator delivering clean 5V/12V to FPGA I/O banks, analog front-ends, and communication interfaces. Use Value: Supports hot-swap capability and maintains regulation during brownouts due to 3.6V minimum input and robust OVL protection. |
| Industrial Power Supplies | Wall Transformer Replacement |
Use Scenario: Replacing linear regulators or discrete buck solutions in factory automation equipment requiring high reliability over –40°C to +150°C. IC Role / Device Role / Timing Role: Main DC-DC converter handling 24V/48V industrial bus inputs, delivering up to 3.5A with minimal thermal derating. Use Value: Eliminates need for external thermal management while meeting long-term operational lifetime requirements in sealed enclosures. |
Use Scenario: Integrated AC/DC adapter replacement in medical devices and test equipment where low standby power and compact size are critical. IC Role / Device Role / Timing Role: Secondary-side buck regulator accepting 9–33V DC input from offline flyback or LLC stage, generating regulated 3.3V/5V outputs. Use Value: Achieves <75µA no-load current and <15mV ripple - meets stringent energy efficiency and EMI standards for Class II medical applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Lower max input (15V), lower IOUT (1.5A), no integrated boost diode, same MSOP-10 package. | Suitable for low-voltage, lower-current applications; lacks 62V transient tolerance and automotive temp grade. | Select when input is ≤15V and thermal budget permits external boost diode; not drop-in for LT3972HMSE#TRPBF's 33V/3.5A/150°C use case. |
| MP2451DT-LF-Z | Higher IQ (260µA), no PG flag, no SYNC, 36V max input, SOIC-8 package, no exposed pad. | Cost-optimized for consumer-grade applications; lacks automotive qualification and thermal performance. | Consider only for non-automotive, non-industrial designs where 150°C operation and 62V surge immunity are unnecessary. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, LT3972HMSE#TRPBF uniquely combines 33V input, 3.5A output, 75µA quiescent current, 150°C rating, and integrated boost diode in a thermally optimized MSOP-10 - making it irreplaceable for high-reliability automotive and industrial buck conversion where all four attributes are mandatory.
Availability
LT3972HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and distributed supply regulation requiring stable component supply across extended temperature and high-reliability production programs.
Supply support for LT3972HMSE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3972 product line delivers high-efficiency, wide-input buck regulators with integrated power stages and automotive-grade reliability - engineered specifically for demanding power conversion in harsh environments where input transients, thermal stress, and long-term stability are critical.
FAQ
What is the maximum input voltage rating for LT3972HMSE#TRPBF?
The LT3972HMSE#TRPBF operates continuously up to 33V input and withstands non-repetitive 62V transients for up to one minute. Its overvoltage lockout activates at ~33V (minimum), disabling switching to protect downstream circuitry while sustaining the transient. This makes LT3972HMSE#TRPBF suitable for automotive load-dump scenarios and industrial 36V bus applications.
Does LT3972HMSE#TRPBF require an external boost diode?
No, LT3972HMSE#TRPBF integrates the boost Schottky diode internally - only an external boost capacitor is required between BOOST and SW pins. This eliminates the need for an external diode, simplifying layout, reducing BOM count, and improving reliability compared to controllers requiring discrete boost diodes.
What is the function of the BD pin on LT3972HMSE#TRPBF?
The BD (Boost Diode) pin on LT3972HMSE#TRPBF connects to the anode of the external Schottky diode used in the bootstrap circuit. It also supplies bias current to the internal regulator. When VOUT >3V, LT3972HMSE#TRPBF draws bias current from the output via BD, improving light-load efficiency - a feature confirmed in the Electrical Characteristics table and Applications Information section.
Can LT3972HMSE#TRPBF synchronize to an external clock?
Yes, LT3972HMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting frequencies from 250kHz to 2MHz with fast edge rates (<1µs). This enables EMI reduction through frequency dithering or alignment with system clocks - a documented capability verified in the Pin Functions and Applications Information sections of the datasheet.
What thermal performance does the MSOP-10 package provide for LT3972HMSE#TRPBF?
The LT3972HMSE#TRPBF MSOP-10 package features an exposed pad (Pin 11 = GND) with θJA = 45°C/W and θJC = 10°C/W. When soldered to a 2-layer PCB with ≥1 in² copper pour, it sustains 3.5A output at ambient temperatures up to +85°C without forced airflow - validated by thermal characterization data in the datasheet's Typical Performance Characteristics.
LT3972HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 33V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 230kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3972HMSE#TRPBF FAQ
1.How can I place an order for LT3972HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3972HMSE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3972HMSE#TRPBF reliable?
The price and inventory of LT3972HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3972HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3972HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3972HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3972HMSE#TRPBF?
LT3972HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3972HMSE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3972HMSE#TRPBF?
For technical support, including LT3972HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3972HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3972HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3972HMSE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3972HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3972HMSE#TRPBF?
All LT3972HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3972HMSE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3972HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3972HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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